基于预测的卫星功率控制算法

Prediction-based Power Control Algorithm in Satellite Communications

针对卫星通信系统传输时延大的特点,提出了一种适用于卫星移动通信长时延信道的上行功率控制算法。该算法基于信干比平衡准则,使用ARIMA预测模型以获得未来的信道增益值,再根据实际SIR、实际信道增益及目标SIR得出下一周期发射功率。仿真结果表明,该算法在MES低速移动情况下,能够有效克服长时延引起的功率控制滞后性,较经典算法提高了10%的概率收敛在2 dB控制误差内。

Aiming at the characteristics of large delay of transmission in satellite communication system, an uplink power control algorithm suitable for long-delay channel of satellite mobile communication is proposed. The algorithm is based on the signal-to-interference ratio balancing criterion and uses the ARIMA prediction model to obtain future channel gain values. Then, the next period of transmit power is derived based on the actual SIR, the actual channel gain, and the target SIR. The simulation results indicate that the proposed algorithm can effectively overcome the power control hysteresis caused by long delay in the case of MES low-speed movement, and improves the convergence probability by 10% in the 2 dB control error compared with the classical algorithm.